Mineral concession rules 

 -  1960 
 - 59p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geoparphy
<br/><br/><label>Dewey Class. No.: </label>U671:Z,2gN60, K0/GD